我国最大冻土深度变化及初步解释

CHANGE OF MAXIMUM FROZEN SOIL DEPTH IN CHINA AND ITS PRIMARY EXPLANATION

利用我国年最大冻土深度数据集 ,分析了我国最大冻土深度的空间分布及年代际变化。结果表明 ,我国最大冻土深度 2 0世纪 80年代以来开始减小 ,90年代显著减小。冻土深度减小的事实 ,反映了我国冬季极端最低气温升高与我国年平均日较差显著变小的趋势。冻土对气候变化具有敏感性。

With the annual maximum frozen soil depth data of China, analysis is made of the special distribution and decadal change during the recent 50 years. The results show that the annual maximum frozen soil depth in China began to decrease since the 1980s, and decreased more distinctly during the 1990s. The decreasing of the maximum frozen soil depth is in accordance with the climate change (rising of minimum temperature and decreasing of the annual average daily temperature range). It indicates that the maximum frozen soil depth is sensitive to the climate change in China.